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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd83c02ead45773011cd5fdf9c80bbb34fb14acaea5f7b709f1a3a04beffe147' 
  AND token = 'c+b6/TU+MrxhNGOId48FHcUSNvsHsRe1mX6KNjx4AVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}